<!doctype html>
<html lang="en">
	<head>
		<title>three.js misc - lookAt</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				color: #404040;
				font-family:Monospace;
				font-size:13px;
				text-align:center;

				background-color: #ffffff;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
			}

			a {

				color: #0080bb;
			}
		</style>
	</head>
	<body>
		<div id="info"><a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - Object3D::lookAt() demo</div>

		<script src="../build/Three.js"></script>

		<script src="js/Stats.js"></script>

		<script>

			var container, stats;

			var camera, scene, renderer;

			var mesh, geometry, sphere;

			var mouseX = 0, mouseY = 0;

			var windowHalfX = window.innerWidth / 2;
			var windowHalfY = window.innerHeight / 2;

			document.addEventListener( 'mousemove', onDocumentMouseMove, false );

			init();
			animate();


			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = 3200;
				scene.add( camera );

				sphere = new THREE.Mesh( new THREE.SphereGeometry( 100, 20, 20 ), new THREE.MeshNormalMaterial( { shading: THREE.SmoothShading } ) );
				scene.add( sphere );

				var geometry = new THREE.CylinderGeometry( 0, 10, 100, 3 );
				geometry.applyMatrix( new THREE.Matrix4().setRotationFromEuler( new THREE.Vector3( Math.PI / 2, Math.PI, 0 ) ) );

				var material = new THREE.MeshNormalMaterial();

				for ( var i = 0; i < 1000; i ++ ) {

					var mesh = new THREE.Mesh( geometry, material );
					mesh.position.x = Math.random() * 4000 - 2000;
					mesh.position.y = Math.random() * 4000 - 2000;
					mesh.position.z = Math.random() * 4000 - 2000;
					mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 4 + 2;
					scene.add( mesh );

				}

				scene.matrixAutoUpdate = false;

				renderer = new THREE.WebGLRenderer();
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.sortObjects = false;
				container.appendChild( renderer.domElement );

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '0px';
				stats.domElement.style.zIndex = 100;
				container.appendChild( stats.domElement );

			}

			function onDocumentMouseMove(event) {

				mouseX = ( event.clientX - windowHalfX ) * 10;
				mouseY = ( event.clientY - windowHalfY ) * 10;

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				var time = Date.now() * 0.0005;

				sphere.position.x = Math.sin( time * 0.7 ) * 2000;
				sphere.position.y = Math.cos( time * 0.5 ) * 2000;
				sphere.position.z = Math.cos( time * 0.3 ) * 2000;

				for ( var i = 1, l = scene.children.length; i < l; i ++ ) {

					scene.children[ i ].lookAt( sphere.position );

				}

				camera.position.x += ( mouseX - camera.position.x ) * .05;
				camera.position.y += ( - mouseY - camera.position.y ) * .05;
				camera.lookAt( scene.position );

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
